/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.plan.statement.component;

import org.apache.iotdb.db.mpp.plan.expression.Expression;
import org.apache.iotdb.db.mpp.plan.expression.multi.FunctionExpression;
import org.apache.iotdb.db.mpp.plan.statement.StatementNode;

import java.util.ArrayList;
import java.util.List;

/**
 * This class maintains information of {@code GROUP BY LEVEL} clause.
 */
public class GroupByLevelComponent extends StatementNode {

    protected int[] levels;
    protected List<Boolean> isCountStar = new ArrayList<>();

    public int[] getLevels() {
        return levels;
    }

    public void setLevels(int[] levels) {
        this.levels = levels;
    }

    public void updateIsCountStar(Expression rawExpression) {
        if (rawExpression instanceof FunctionExpression) {
            isCountStar.add(((FunctionExpression) rawExpression).isCountStar());
        } else {
            isCountStar.add(false);
        }
    }

    public boolean isCountStar(int i) {
        return isCountStar.get(i);
    }

    public String toSQLString(boolean hasGroupByTime) {
        StringBuilder sqlBuilder = new StringBuilder();
        if (hasGroupByTime) {
            sqlBuilder.append(", ");
        } else {
            sqlBuilder.append("GROUP BY ");
        }
        sqlBuilder.append("LEVEL = ");
        for (int i = 0; i < levels.length; i++) {
            sqlBuilder.append(levels[i]);
            if (i < levels.length - 1) {
                sqlBuilder.append(',').append(' ');
            }
        }
        return sqlBuilder.toString();
    }
}
